I have a question that I am assuming has a very easy answer (hopefully). I am trying to turn on and off the power to a pcb really fast, on the order of 1us. My problem is that my board has some bypass caps which slow my rise and fall time of my switch, on the order of 1ms. I am using a simple NMOS switch with the part FDBL0090N40. My mosfet in my simulation is similar and was already in the LTspice library, and the 10uF load represents my board.
My thought is that when gate voltage is applied, there is a ground path to quickly dump the 10uF load, as seen in the fast discharge of the blue trace. Now, I was thinking that the 22uF would provide the charging transient current to give a quicker charge. The caps have a 50m ESR. I guess I could try a push pull configuration, but I was hoping that this simple implementation would work. The 22uF are those spot welded stacked ceramic caps that I have in my collection. I didn't want the high ESR of electrolytics.